Now showing items 21-40 of 72

  • Cooperative energy harvesting-adaptive MAC protocol for WBANs 

    Esteves, Volker; Antonopoulos, Angelos; Kartsakli, Elli; Puig Vidal, Manel; Miribel Català, Pere Lluís; Verikoukis, Christos (2015-06-01)
    Article
    Open Access
    In this paper, we introduce a cooperative medium access control (MAC) protocol, named cooperative energy harvesting (CEH)-MAC, that adapts its operation to the energy harvesting (EH) conditions in wireless body area networks ...
  • Cross layer access point selection mechanisms for a distributed queuing MAC protocol 

    Antonopoulos, Angelos; Alonso Zárate, Jesús; Kartsakli, Elli; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (2013-07)
    Article
    Restricted access - publisher's policy
    The Distributed Queuing with Collision Avoidance (DQCA) Medium Access Control (MAC) protocol has been presented in the literature as a high-performance protocol for WLANs. Previous work regarding DQCA is focused on the ...
  • Cross-layer design and optimization of medium access control protocols for wlans 

    Kartsakli, Elli (Universitat Politècnica de Catalunya, 2012-02-16)
    Doctoral thesis
    Open Access
    This thesis provides a contribution to the field of Medium Access Control (MAC) layer protocol design for wireless networks by proposing and evaluating mechanisms that enhance different aspects of the network performance. ...
  • Cross-layer enhancement for WLAN systems based on a distributed queuing MAC protocol 

    Verikoukis, Christos; Alonso Zárate, Jesús; Kartsakli, Elli; Cateura, A; Alonso Zárate, Luis Gonzaga (Institute of Electrical and Electronics Engineers (IEEE), 2006-05-31)
    Conference lecture
    Restricted access - publisher's policy
    Cross-Layer optimization is an emerging research topic. This paper proposes two novel cross-layer mechanisms to be included in a WLAN system where a near-optimum distributed MAC protocol is used. Their performance in terms ...
  • Cross-layer enhancement for WLAN systems with heterogeneous traffic based on DQCA 

    Kartsakli, Elli; Cateura, A; Alonso Zárate, Jesús; Verikoukis, Christos; Alonso Zárate, Luis Gonzaga (Institute of Electrical and Electronics Engineers (IEEE), 2007-06-30)
    Conference lecture
    Restricted access - publisher's policy
    Voice transmission over WLAN and cross-layer optimization are emerging research topics. This paper proposes two novel cross-layer mechanisms for a WLAN system where the offered traffic is of mixed nature (voice and data) ...
  • Dealing with VoIP calls during ‘busy hour’ in LTE 

    Antonopoulos, Angelos; Kartsakli, Elli; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (INTECH, 2011)
    Part of book or chapter of book
    Open Access
  • Dynamic energy efficient distance-aware base station switch on/off scheme for LTE-advanced 

    Kartsakli, Elli; Bousia, Alexandra; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (2012)
    Conference report
    Restricted access - publisher's policy
    Reducing the energy consumption in wireless networks has become a significant problem, not only because of its great impact on the global energy crisis, but also because it represents a noteworthy cost for telecommunication ...
  • End-to-end communication challenges in M2M systems for mHealth applications 

    Kartsakli, Elli; Lalos, Aristeidis; Antonopoulos, Angelos; Tennina, Stefano; Di Renzo, Marco; Alonso Zárate, Luis Gonzaga (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Conference report
    Restricted access - publisher's policy
    In the new era of connectivity, marked by the explosive number of wireless electronic devices and the need for smart and pervasive applications, Machine-to-Machine (M2M) communications are an emerging technology that enables ...
  • Energy efficient base station maximization switch off scheme for LTE-advanced 

    Bousia, Alexandra; Kartsakli, Elli; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (2012)
    Conference report
    Restricted access - publisher's policy
    In this paper, we introduce a solution to a maximization problem for switching off Base Stations in an LTE-Advanced wireless network. Our scheme exploits the existence of idle periods in a cellular network during “night ...
  • Energy-efficient infrastructure sharing in multi-operator mobile networks 

    Antonopoulos, Angelos; Kartsakli, Elli; Bousia, Alexandra; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (2015-05-01)
    Article
    Open Access
    Network infrastructure sharing and base station switching off mechanisms have been recently introduced as promising solutions toward energy and cost reduction in cellular networks. Although these techniques are usually ...
  • Energy efficient techniques for 802.11n multiuser MAC WLANs 

    Gajic, Danica; Kartsakli, Elli; Zorba Barah, Nizar; Liß, Christian; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (2013)
    Conference report
    Restricted access - publisher's policy
    In this paper we evaluate the energy efficiency of MIMO technologies introduced in the emerging IEEE 802.11n standard for infrastructure based WLANs. The main focus is on exploiting multiuser capabilities of MIMO technologies, ...
  • Energy impact of outdoor small cell backhaul in green heterogeneous networks 

    Mesodiakaki, Agapi; Adelantado Freixer, Ferran; Antonopoulos, Angelos; Kartsakli, Elli; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (2014)
    Conference report
    Restricted access - publisher's policy
    Small cells (SCs) are expected to be densely deployed during the next few years to enhance the network capacity of future heterogeneous networks (HetNets). Due to their dense deployment, not all SCs are expected to have a ...
  • Enhanced operation of DQMAN based wireless ad hoc networks 

    Alonso Zárate, Jesús; Kartsakli, Elli; Cateura, A; Verikoukis, Christos; Alonso Zárate, Luis Gonzaga (Institute of Electrical and Electronics Engineers (IEEE), 2007-10-01)
    Conference lecture
    Restricted access - publisher's policy
    This paper presents two novel mechanisms aimed at improving the packet transmission delay distribution and the channel usage efficiency of wireless ad hoc networks when using the DQMAN (distributed queuing MAC protocol for ...
  • Enhancing quality of life with wireless sensor technology 

    Kartsakli, Elli; Antonopoulos, Angelos; Tennina, Stefano; Lalos, Aristeidis; Mekikis, Prodromos Vasileios; Alonso Zárate, Luis Gonzaga; Graziosi, Fabio; Di Renzo, Marco; Verikoukis, Christos (Institute of Electrical and Electronics Engineers (IEEE), 2013-12)
    Article
    Restricted access - publisher's policy
    A co-operative project involving both industry and academia is designing an innovative Wireless Sensor Network for more effective healthcare of elders. The median age of the world population has shown a steady increase ...
  • Estudio del rendimiento de protocolos de acceso para redes inalámbricas con antenas direccionales 

    Alonso Zárate, Jesús; Cateura, A; Kartsakli, Elli; Verikoukis, Christos; Alonso Zárate, Luis Gonzaga (Unión Científica Internacional de Radio, 2006-09-30)
    Conference lecture
    Restricted access - publisher's policy
    The basic feature of the emerging high throughput IEEE 802.11n standard (and other standards) is the presence of directional antennas at network nodes. In this work, we evaluate the performance of media access control ...
  • Evaluación de algoritmos Cross-Layer para la optimización de sistemas de comunicaciones inalámbricas 

    Alonso Zárate, Jesús; Ramos, I.; Kartsakli, Elli; Verikoukis, Christos; Alonso Zárate, Luis Gonzaga (TELECOM I+D 2006, 2006-12-31)
    Conference lecture
    Restricted access - publisher's policy
    En el presente trabajo se proponen siete diferentes técnicas cross-layer diseñadas para mejorar la eficiencia de redes inalámbricas ad hoc, operando con el protocolo de acceso al medio definido en el estándar 802.11. ...
  • Experimental study of bluetooth, ZigBee and IEEE 802.15.4 technologies on board high-speed trains 

    Higuera Portilla, Jorge Eduardo; Kartsakli, Elli; Valenzuela González, José Luis; Alonso Zárate, Luis Gonzaga; Laya Romero, Andrés Ernesto; Martínez, Raquel; Aguilar, Alicia (2012)
    Article
    Restricted access - publisher's policy
    This paper studies the feasibility of using low-power wireless technologies such as Bluetooth, IEEE 802.15.4 and ZigBee in high-speed railway scenarios that involve bidirectional ground-to-train communication. The ...
  • Experimental study of Bluetooth, ZigBee and IEEE 802.15.4 technologies on board high-speed trains 

    Higuera, Jorge; Kartsakli, Elli; Valenzuela González, José Luis; Alonso Zárate, Luis Gonzaga; Laya Romero, Andrés Ernesto; Martínez, Raquel; Aguilar, Alicia (Institute of Electrical and Electronics Engineers (IEEE), 2012)
    Conference report
    Restricted access - publisher's policy
    This paper studies the feasibility of using low-power wireless technologies such as Bluetooth, IEEE 802.15.4 and ZigBee in high-speed railway scenarios that involve bidirectional ground-to-train communication. The presented ...
  • Exploiting network coding for smart healthcare: scenarios and challenges sensor networks for sustainable development 

    Kartsakli, Elli; Antonopoulos, Angelos; Verikoukis, Christos (Taylor & Francis Group, 2014)
    Part of book or chapter of book
    Restricted access - publisher's policy
  • Exploiting network coding for smart healthcare: scenarios and research challenges 

    Kartsakli, Elli; Antonopoulos, Angelos; Verikoukis, Christos (2014-06-25)
    Part of book or chapter of book
    Restricted access - publisher's policy